Answer to Question #59831 in Cell Biology for Sanjukta Ghosh

I have some short questions-
i) Wikipedia says that dynamic instability is the coexistence of assembly and disassembly at the ends of a microtubule. But according to Gerald Karp it is the coexistance of assembly and disassembly of microtuble at its plus end only. I also agree with the latter for at the minus end the GTP is not hydrolysed. What do you think is correct?
ii) Does microtubules act as scaffold for attachment of cell organelles to maintain their positions within a cell?